Filament swinging submerged-arc welding tool for 3G position of saddle-shaped welding seam

Abstract

The utility model belongs to the technical field of high-temperature gas cooled reactor equipment manufacturing, and discloses a saddle-shaped welding seam 3G position filament swing submerged arc welding tool, which utilizes a welding robot and a tool structure design to meet standards and design specifications and greatly improve welding efficiency. The problem that a traditional submerged-arc welding seam cannot be formed can be solved, and the welding efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the high temperature gas cooled reactor equipment manufacturing technical field, concretely relates to a kind of large saddle quantity saddle-shaped weld 3G position continuous variable angle narrow gap thin wire swing submerged-arc welding frock of high temperature gas cooled reactor steam generator hot gas guide pipe and cylinder assembly. BACKGROUND

[0002] High temperature gas cooled reactor refers to the nuclear reactor technology with high temperature characteristics and using gas for core cooling. It uses graphite as moderator and helium as coolant, and realizes power generation through nuclear energy-thermal energy-mechanical energy-electric energy conversion. As an advanced fourth-generation nuclear power reactor technology, high temperature gas cooled reactor has extremely high safety, and is called "fool reactor". Even in the case of losing all cooling capacity and facing serious accidents, the reactor can remain in a safe state without any external intervention, and there is no core meltdown accident. The special design of fuel element enables it to withstand high temperature and has less residual heat, which can be removed by natural heat dissipation. High temperature gas cooled reactor has high thermal efficiency, because gas working substance can contain more heat, thereby more efficiently converting into electric energy. It can respond faster to changes in load demand, and meet different power demands by adjusting the power output of the reactor. The high outlet temperature of high temperature gas cooled reactor can meet the vast majority of heat source demands in the fields of ethanol purification, petroleum chemical industry and hydrogen production.

[0003] In nuclear island main equipment and pressure vessel, the intersecting weld between cylinder and nozzle is similar to saddle in shape, and is called "saddle-shaped" weld. There are mainly two design structures for saddle-shaped weld of existing domestic and foreign nuclear power equipment and conventional pressure vessel. One is "false saddle" structure form, the bottom of the groove is flat, and the welding position is 1G. The welding difficulty of this structure itself is low, because there is no slope, and gravity has little effect on weld forming, but it needs to reserve a large amount of size allowance at the procurement stage, and then remove it by machining, so its procurement cost is higher, and the machining resource is wasted at the later stage. The larger the saddle quantity, the more prominent the above problems. The other is "true saddle" structure form, the bottom of the groove is saddle surface, and there is a certain slope. The machining allowance is less, but usually the saddle quantity does not exceed 40mm, and the upper and lower limit slope does not exceed 10°, which is still within the range of flat welding. The gravity has an effect on molten pool metal during welding, although there are differences in forming and performance, but it can still meet the requirements. For "true saddle" structure, with the increase of saddle quantity (slope increase), the flow of molten pool metal during welding increases. When the slope is greater than or equal to 15°, the welding position changes from flat welding to vertical welding, and the molten pool iron is affected by gravity too much, which exceeds the surface tension of molten pool itself, causing the iron to escape in all directions, thereby causing poor weld forming and affecting welding quality.

[0004] In the product structure of high temperature gas cooled reactor, the hot gas duct nozzle flange of SG needs to be welded with the upper cylinder, wherein the wall thickness of SG cylinder is 205mm, the bottom surface of the bevel is continuous saddle shape (welding trace is shown in the figure Figure 4 ), the welding trace is 3G (downward)→1G→3G (upward)→1G→3G (downward)→1G→3G (upward)→1G, 8 different trace sections are projected on the circular arc as 8 non-equal circular arc areas, the space position of the welding gun and the slope change in real time, the maximum slope difference is about 36° (the maximum angle of 3G upward is 18°, the maximum angle of 3G downward is -18°), and the maximum height difference (saddle amount) is about 380mm. The saddle weld thickness of the upper cylinder and the hot gas duct nozzle flange is large, the depth of the bevel in the circumferential direction of the cylinder is 260mm, and about 1500Kg of welding rod is consumed for the welding of the hot gas duct nozzle flange of one SG. The size of the connecting pipe of the RPV of the high temperature gas cooled reactor is consistent with that of the SG, but the outer diameter and the thickness of the cylinder are larger (6180mm and 240mm respectively), and the saddle amount is about 260mm. For the true saddle welding structure with such a large saddle amount, the mature case that can be referred to at present is the high temperature gas cooled reactor demonstration project. The thickness of the cylinder of the project is 180mm, the saddle difference of the connecting pipe is smaller, the welding rod arc welding process is adopted, and the welding skill difference exists, so that the quality control is at risk. In addition, due to the large depth of the bevel, the utilization rate of the welding rod is not high, and nearly 1500Kg of welding rod is consumed for the welding of the hot gas duct nozzle flange of a single steam generator.

[0005] Some enterprises try to use automatic TIG welding, but there are defects in the technology, and the welding quality of the downward slope section of -18° cannot be guaranteed (when the upper layer of weld metal is not fully melted, it is covered by liquid metal, the penetration depth is shallow, and when multi-layer welding is performed, the interlayer does not achieve complete metallurgical bonding, and interlayer unmelted defects are easily generated), and there is a great quality risk in product manufacturing. Practical new type content

[0006] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a saddle-shaped weld 3G position fine wire swing submerged arc welding tool, which aims at solving the problems existing in the prior art.

[0007] The technical scheme adopted by the utility model to solve its technical problems is:

[0008] A saddle-shaped weld 3G position fine wire swing submerged arc welding tool, comprising a steam generator, a welding robot, an operation platform, a lifting device, an external supporting device, an internal supporting device and a heating assembly, the steam generator comprises a hot gas duct and a cylinder assembly;

[0009] The external support device is used for fixing the hot gas guide pipe and the cylinder assembly;

[0010] The operation platform is arranged above the welding area of the hot gas guide pipe and the cylinder assembly;

[0011] The welding robot and the lifting device are arranged on one side of the hot gas guide pipe and the cylinder assembly;

[0012] The internal support device is arranged in the hot gas guide pipe and the cylinder assembly and is in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly;

[0013] The heating assembly is connected with the internal support device, the heating assembly comprises an electric heating device and a plurality of heating pieces, the electric heating device is electrically connected with the heating pieces, the heating pieces form a heating end of the heating assembly, the heating pieces are connected with the internal support device, the heating pieces are provided with a saddle-shaped end surface in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly, and adjacent heating pieces are connected to form an annular structure.

[0014] Preferably, the welding robot comprises a robot support table, a robot base, a multi-axis movement mechanism, a multi-axis welding arm and a welding gun, the robot base is arranged on the robot support table, the multi-axis movement mechanism is arranged on the robot base, the multi-axis welding arm is connected with a Z-direction movement end of the multi-axis movement mechanism, and the welding gun is connected with a Z-direction movement end of the multi-axis welding arm.

[0015] Preferably, a plurality of arc-shaped fixing supports are arranged on the internal support device, the arc-shaped fixing supports are arranged around the internal support device, and the heating pieces are connected with the arc-shaped fixing supports.

[0016] Preferably, the operation platform is provided with an operation opening, and the operation opening corresponds to the welding position of the hot gas guide pipe and the cylinder assembly.

[0017] Preferably, the lifting device is a cherry picker.

[0018] Preferably, the external support device comprises an external support seat, and a plurality of support roller pieces for supporting the hot gas guide pipe and the cylinder assembly are arranged on the external support seat.

[0019] Preferably, the number of the internal support devices is two, and the internal support devices are symmetrically arranged on both sides of the welding position of the hot gas guide pipe and the cylinder assembly.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The tool is applied to saddle-shaped weld joint welding of a hot gas guide pipe and a cylinder assembly, can solve the problem that a traditional submerged arc welding joint cannot be formed under the premise of meeting standards and design specifications and greatly improving welding efficiency, and improves the welding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 It is a schematic view of the tool of the present application.

[0024] Figure 2 It is a schematic view of the heating assembly of the present application.

[0025] Figure 3 It is a schematic view of the weld joint arrangement of the present application.

[0026] Figure 4 It is a schematic view of the welding position of the weld joint of the present application.

[0027] Figure 5 It is a schematic view of the arc starting point position of the weld joint of the present application.

[0028] Figure 6 It is a schematic view of the structure of the arc-shaped fixed support of the present application.

[0029] Among them:

[0030] 1-welding robot, 2-operation platform, 3-lifting device, 4-external support device, 5-internal support device, 6-heating assembly, 7-hot gas guide pipe, 8-supporting roller, 9-heating sheet, 10-arc-shaped fixed support. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the above-mentioned purposes, features and advantages of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments and features in the embodiments can be combined with each other without conflict. In the following description, a lot of specific details are described in order to fully understand the present application, and the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0033] Embodiment:

[0034] Referring to Figures 1-6 A saddle-shaped welding seam 3G position fine wire swing submerged arc welding tool includes a steam generator, a welding robot 1, an operation platform 2, a lifting device 3, an external support device 4, an internal support device 5, and a heating assembly 6. The steam generator includes a hot gas guide pipe 7 and a cylinder assembly.

[0035] The external support device 4 is used for fixing the hot gas guide pipe 7 and the cylinder assembly. The external support device includes an external support seat, and a plurality of support roller assemblies 8 are arranged on the external support seat to support the hot gas guide pipe and the cylinder assembly.

[0036] The operation platform 2 is arranged above a welding area of the hot gas guide pipe and the cylinder assembly. The operation platform 2 is provided with an operation opening corresponding to a welding position of the hot gas guide pipe and the cylinder assembly.

[0037] The welding robot 1 and the lifting device 3 are arranged on one side of the hot gas guide pipe and the cylinder assembly.

[0038] The internal support device 5 is arranged in the hot gas guide pipe and the cylinder assembly and is in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly. The number of the internal support devices is two, and the internal support devices are symmetrically arranged on both sides of the welding position of the hot gas guide pipe and the cylinder assembly.

[0039] The heating assembly 6 is connected with the internal support device 5. The heating assembly 6 has a heating end in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly.

[0040] An operator enters the operation platform 2 through the lifting device 3 and controls the welding robot 1 to perform welding.

[0041] Specifically, the welding robot 1 includes a robot support table, a robot base, a multi-axis movement mechanism, a multi-axis welding arm, and a welding torch. The robot base is arranged on the robot support table. The multi-axis movement mechanism is arranged on the robot base. The multi-axis welding arm is connected with a Z-direction movement end of the multi-axis movement mechanism. The welding torch is connected with a Z-direction movement end of the multi-axis welding arm. The welding torch section of the present application adopts a flexible flux conveying pipe to realize the adjustment of the falling position and height of the flux, which can be applied to the flux conveying in the welding process of both sides and the middle welding bead. The welding power supply adopts the QINEO NEXT617 Premium power supply of CLOOS. The power supply has two modes of high-speed pulse mode (constant voltage and constant speed wire feeding) and deep penetration welding mode (constant current and variable speed wire feeding).

[0042] In the embodiment, the wire with a diameter of 1.6 mm is used as the electrode and the filler metal to make the arc energy more concentrated and reduce the influence of gravity on the molten pool. For the wire submerged arc welding, the external characteristic of the wire submerged arc welding power source is designed as a constant voltage characteristic (high-speed pulse mode) to ensure the stability of the voltage during the welding process and the melting of the wire and the uniformity of the welding quality. The external characteristic can ensure that the power source can maintain the stability of the output voltage during the welding process even if the load state changes instantaneously (such as short-circuiting transfer of droplets, particle transfer, and jet transfer), thereby maintaining the stable progress of the welding process. The pulse phase is controlled by the voltage and is not easily affected by external factors such as the change of the dry elongation. The reference current phase is controlled by the current, and the arc can still be maintained even in the case of low current. Thanks to the effective internal control, the voltage control of the pulse phase can ensure the stability of the arc. Due to the stable direction and strong pressure of the arc, a very high welding speed can be achieved.

[0043] At the same time, the addition of the pulse mode further improves the penetration of the arc and can obtain a larger depth-to-width ratio of the molten pool. At this time, the surface tension of the molten pool > its own gravity, which limits the flow of the molten pool. At the same time, the pulse submerged arc welding can make the weld forming more beautiful and the internal metal organization more uniform during the welding, and the metallographic structure is closer to the base material.

[0044] The heating assembly 6 of the embodiment includes an electric heating device and a plurality of heating pieces 9. The electric heating device is electrically connected with the heating pieces 9. The heating pieces 9 form the heating end of the heating assembly 6. The heating pieces 9 are connected with the internal support device 5. The heating pieces 9 are provided with end faces that are in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly and are saddle-shaped. The heating pieces 9 of the embodiment are independently heated and set, can be controlled by temperature in different zones, and can minimize the temperature difference between the connecting pipe and the cylinder. The internal support device provided can also be used during welding and intermediate heat treatment to reduce welding deformation.

[0045] In the embodiment, the specific structure of the connection between the heating pieces 9 and the internal support device 5 is as follows:

[0046] The internal support device is provided with a plurality of arc-shaped fixing supports 10. The arc-shaped fixing supports 10 are arranged around the internal support device. The heating pieces 9 are connected with the arc-shaped fixing supports 10. The adjacent heating pieces 9 are connected to form a ring-shaped structure.

[0047] The tooling of the embodiment is applied to the welding process of the saddle-shaped weld of the hot gas guide pipe and the cylinder assembly. The tooling of the above-mentioned 3G position wire oscillating submerged arc welding of the saddle-shaped weld is used, which includes the following steps.

[0048] S1, fix the hot gas duct and cylinder assembly on the external support device 4, set the welding robot 1 and the lifting device 3 on one side of the external support device 4, install the internal support device 5 and the heating assembly 6 in the hot gas duct and cylinder assembly;

[0049] S2, start the heating assembly 6 to preheat the hot gas duct and cylinder assembly;

[0050] S3, weld the welding groove between the hot gas duct and the cylinder assembly:

[0051] s31, first perform a backing weld on the welding groove, then perform a fill weld, and finally perform a cover weld to form a cover weld bead;

[0052] s32, perform a temper bead at the cover weld bead to form a temper bead.

[0053] S4, post-heating the hot gas duct and cylinder assembly;

[0054] S5, heat treatment of the hot gas duct and cylinder assembly;

[0055] S6, remove the internal support device 5 in the hot gas duct and cylinder assembly;

[0056] S7, non-destructive testing of the hot gas duct and cylinder assembly.

[0057] Specifically, in step S1, clean the welding surface and the area within a range of at least 50 mm near the welding groove between the hot gas duct and the cylinder assembly to ensure that the groove surface meets the cleanliness requirements.

[0058] Specifically, in step S2, the preheating temperature ranges from 175 to 250°C, and the preheating time is not less than 2 hours;

[0059] In step S3, monitor the temperature between the welding beads of the hot gas duct and the cylinder assembly during welding to ensure that it does not exceed 250°C. When the workpiece temperature rises due to welding heat input, the temperature of the welding area should be cooled in air to reach between 150 and 250°C before continuing welding, and the recommended temperature difference is ≤50°C. When performing the cover weld, the temperature of the welding area should be maintained between 210 and 250°C by the heating assembly 6.

[0060] In step S4, after the welding is interrupted or completed, the welding area should be post-heated at a temperature of 250-400°C for not less than 4 hours.

[0061] Specifically, in step S3, establish a verification coordinate point before welding, and the number of welding coordinate points is not less than 32. The welding coordinate points in the middle area can be shared by forward welding and reverse welding. For the starting and ending areas, independent welding coordinate points need to be set.

[0062] Specifically, in step s31, the distance between the filler weld area and the edge of the groove is controlled within 2mm of the surface of the groove or below, and then the welding of the cover pass and the temper bead is performed;

[0063] In steps s31 and s32, the number of the cover pass is two or more, and the number of the temper bead is one or more. One end of the cover pass covers the surface of the base material, and the temper bead overlaps the cover pass and is located at 1 / 3 of the width of the cover pass.

[0064] In the present embodiment, according to Figure 3 As shown in FIG. 2, the cover pass is A, B, and C arranged from left to right. According to the flatness of the completed weld and the surface of the base material, the electrode is adjusted to the appropriate position to ensure that the cover pass covers the surface of the groove base material by about 5mm. At the same time, according to the actual width of the groove and the fullness of the weld at position B, it is determined whether to weld B. If the amount of depression at B exceeds 1mm, B needs to be welded.

[0065] The sequence of the temper bead is D and E arranged from left to right. D and E need to overlap at about 1 / 3 of the width of A and C. According to the actual total width of A, B, and C, it is determined whether to perform E. If the groove is narrow, after completing sequence D, if the overlap of weld D and A and C meets the size requirement, E does not need to be performed.

[0066] The base material of the present embodiment is a SA508-3CL.1 forging of American Standard ASME. The SA508-3CL.1 forging has excellent comprehensive mechanical properties and is widely used in the manufacture of nuclear power equipment.

[0067] Specifically, in step S3, the welding groove is a saddle-shaped narrow gap groove with a lock, the bottom groove width is 22mm, the groove surface angle is 2°, and the minimum thickness of the backing plate at the lock is 6mm.

[0068] The backing weld and the filler weld of the welding groove are multi-layer and multi-pass welding. After each pass is welded, the welding agent is cleaned and the weld is inspected to confirm the weld forming quality before the next pass is welded. In the continuous welding process of each pass, the welding position changes in real time, such as Figure 4As shown, 8 stages are experienced around the saddle high point and saddle point, and the 8 stages are projected on the circular arc as 8 non-equal circular arc regions, including: 3G downward→1G→3G upward→1G→3G downward→1G→3G upward→1G; the molten pool iron is different in different regions, which makes the weld forming in different regions have great difference. When flat welding, the gravity is perpendicular to the welding direction, which has little effect on the weld forming; when 3G upward welding, the gravity is opposite to the welding direction, the gravity is opposite to the arc force, the support force of the previously welded metal and the direction of its own surface tension, the molten pool iron will have obvious compression phenomenon, and the final weld forming is narrow and thick; when 3G downward welding, the gravity is the same as the welding direction, the gravity is the same as the arc force and the support force of the previously welded metal, and the only reverse force is the surface tension, the molten pool iron can spread freely to a certain extent, and the weld forming is wide and thin. Therefore, the thickness of the single-layer weld in different regions is inconsistent (especially in 3G upward and 3G downward), which will directly affect the setting of the lifting amount of the next layer welding. In addition, with the accumulation of the groove filling, the difference will become more and more obvious, and in the extreme case, the difference in the groove width of the next welding in the above different regions will be too large due to the difference in the cumulative thickness of the weld (for the groove design structure used in this project, the groove width is consistent at the same depth position), which is beyond the limit range that can be covered by the parameters, thereby causing incomplete fusion.

[0069] Therefore, the welding direction is changed every layer, and the weld forming characteristics of the 8 sub-regions on the circular arc are forced to change: in the next layer welding, the 3G downward region of the previous layer becomes a 3G upward region, the 3G upward region of the previous layer becomes a 3G downward region, and the 1G position remains unchanged, so as to ensure that the cumulative thickness of the weld every two layers on the entire circular arc is consistent (about 7mm), in addition, the weld is narrow and thick when 3G upward welding, the overlap between the welding beads is less in the groove with limited width, and the interlayer fusion is relatively worse, which is more prone to incomplete fusion defects. The above process design inserts a layer of 3G downward weld in the next layer of the original 3G upward region, which can effectively improve the problem of continuous and cumulative weld forming getting worse and worse when welding in the 3G upward region.

[0070] At the same time, the change of the groove width is monitored in real time, and the single-segment thickness supplementary welding is carried out in the region with low cumulative thickness, and the number of supplementary layers is determined according to the actual measurement results. After the supplementary welding, the difference in the groove width of each region needs to be reduced, and the target difference is ≤3mm. After completion, the remaining groove filling is carried out.

[0071] The weld forming characteristics of the 3G upward and 3G downward regions are different, the weld in the 3G upward region is narrow and thick, and the weld in the 3G downward region is wide and thin. In the start and end arc control, the start and end arc points are set in the 3G downward region according to the characteristics of the weld forming in this project. Four regions are set for symmetrical start arc, such as Figure 5As shown, respectively, are an arc starting point 1, an arc starting point 2, an arc starting point 3 and an arc starting point 4, the arc starting position is changed for each welding layer, the joint area is staggered by at least 50 mm, and the deformation concentration caused by continuous same-position arc starting and arc ending can be avoided. The advantage is that the 3G downward area molten pool iron spreading effect is good, the lap transition area is more gentle, the iron can freely fill the gap area, and the unmelted is not easy to produce.

[0072] Specifically, in step S7, the non-destructive inspection items include weld surface visual inspection, weld size inspection, weld surface magnetic powder inspection, weld ultrasonic inspection and weld radiographic inspection.

[0073] To sum up, the welding robot 1 of the present application is a multi-axis moving structure, which controls the welding swing parameters, can realize high-speed and high-frequency welding swing, and the swing trajectory is more accurate. The addition of swing makes the width of each weld not limited by the specification of the filler metal, realizes free control, thereby reducing the arrangement number of each layer of weld, improves the welding efficiency, reduces the risk of unmelted between the layers, makes the molten pool shape more symmetrical, thereby making the weld surface more smooth, the quality is better, and the subsequent polishing workload is reduced; in the process of swing welding, the arc also has a stirring effect on the molten pool, which helps to discharge gas, thereby reducing the generation of pores, and at the same time, the fine wire pulse submerged arc welding technology is adopted, the pulse arc has a stirring effect on the molten pool, makes the weld forming more beautiful, the internal metal organization is more uniform, and the metallographic structure is closer to the base material; the pulse arc energy is more concentrated, under the same condition, the line energy input can be greatly reduced, the grain is refined, and the weld performance is improved. In addition, the concentrated arc energy can obtain good arc penetration, the base material and the filler metal in the arc coverage area are quickly melted, the welding speed can be increased under the premise of improving the deposition efficiency, and the production efficiency is significantly improved. At the same time, due to the good arc penetration, when setting the parameters, the swing dwell time does not need to be set to obtain good edge fusion effect, the molten pool iron is limited in the arc pointing area, effectively improving the problem that the molten pool is not controlled to escape and thus forming is poor. At the same time, the fine wire pulse energy is more concentrated, which reduces the degree of influence of the molten pool by gravity while ensuring that the molten area has enough heat to make the gas and slag overflow the weld, perfectly solving the problems of poor weld forming, pores and slag inclusion defects under continuous uphill and downhill large-angle abrupt structures.

[0074] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, so any modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A tooling for 3G position fine wire weave submerged arc welding of a saddle-shaped weld 3, characterized in that, The application relates to a welding device for a steam generator, which comprises a hot gas guide pipe and a cylinder assembly, a welding robot, an operating platform, a lifting device, an external supporting device, an internal supporting device and a heating assembly. The external supporting device is used for fixing the hot gas guide pipe and the cylinder assembly. The operating platform is arranged above a welding area of the hot gas guide pipe and the cylinder assembly. The welding robot and the lifting device are arranged on one side of the hot gas guide pipe and the cylinder assembly. The internal supporting device is arranged in the hot gas guide pipe and the cylinder assembly and is in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly. The heating assembly is connected with the internal supporting device, the heating assembly comprises an electric heating device and a plurality of heating pieces, the electric heating device is electrically connected with the heating pieces, the heating pieces form a heating end of the heating assembly, the heating pieces are connected with the internal supporting device, the heating pieces are provided with a saddle-shaped end surface which is in contact with the inner wall surface of the hot gas guide pipe and the cylinder assembly, and adjacent heating pieces are connected to form an annular structure. The welding robot comprises a robot supporting table, a robot base, a multi-axial moving mechanism, a multi-axial welding arm and a welding gun, the robot base is arranged on the robot supporting table, the multi-axial moving mechanism is arranged on the robot base, the multi-axial welding arm is connected with the Z-direction moving end of the multi-axial moving mechanism, and the welding gun is connected with the Z-direction moving end of the multi-axial welding arm.

2. The saddle-shaped weld 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, The internal supporting device is provided with a plurality of arc-shaped fixing supports which are arranged around the internal supporting device, and the heating pieces are connected with the arc-shaped fixing supports.

3. The saddle-shaped weld 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, The operating platform is provided with an operating opening which corresponds to a welding position of the hot gas guide pipe and the cylinder assembly.

4. The saddle-shaped weld 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, The lifting device is a climbing truck.

5. The saddle-shaped weld 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, The external supporting device comprises an external supporting seat which is provided with a plurality of supporting roller members for supporting the hot gas guide pipe and the cylinder assembly.

6. The saddle-shaped weld 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, The number of the internal supporting devices is two, and the internal supporting devices are symmetrically arranged on both sides of the welding position of the hot gas guide pipe and the cylinder assembly.

7. The saddle welded 3G positional fine wire weave submerged arc welding tooling of claim 1, wherein, ​

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